Author: Dann Corbit
Date: 20:43:36 05/09/02
Go up one level in this thread
On May 09, 2002 at 23:22:08, Slater Wold wrote: >On May 09, 2002 at 23:11:22, Dann Corbit wrote: > >>On May 09, 2002 at 22:24:15, Vincent Diepeveen wrote: >> >>>On May 09, 2002 at 10:27:34, Frank Phillips wrote: >>> >>>>Intel Linux compiler version 6 is faster (about 5%) than Intel version 5 for me, >>>>on a K7 1.4GHz (non XP) - Mandrake 8.2 with icc -O3 -ipo -prof_use >>> >>>and if you try on windows intel c++ 5.0.1 next: >>> CFLAGS = -O3 -G6 -Qaxi -Qxi -Gr -Qprof_genx >> >>You left out this step: >>Then run your program quite a while. I like perft, then an EPD test suite and >>then some games. >> >>>then delete object files and try again: >>> CFLAGS = -O3 -G6 -Qaxi -Qxi -Gr -Qprof_use >> >>I think K7 is OK for -G7 instruction mix flag, isn't it? > >No. -G7 is for P4's which have SSE2 among other things. But it won't emit those instructions. It just has an optimal instruction mix for that chip (P4) which seems to work better for my Athlon. The -G flags are really just for scheduling and for the instruction mix that works best on the named chip. But it should run on any of the inferior chips.
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